The Twilight Zone Tower of Terror at Disney’s Hollywood Studios uses a sophisticated computer system that creates a randomized drop sequence, meaning the number of drops varies every time you ride. While the ride profile changes, you can generally expect between 4 and 8 drops during a single cycle. These drops aren't just gravity-fed; the elevator car is actually pulled down faster than terminal velocity by high-speed cables, reaching speeds of roughly 39 mph. The "random" sequence was introduced in 2002 to ensure that even frequent visitors are surprised. Some sequences include "fake-outs" where the car rises suddenly after a partial drop, while every sequence is guaranteed to include at least one "big" drop from the full 13-story height (roughly 130 feet) to the bottom of the shaft.